DIY LEDs - The write-up

[kcress]

jrizo1; You never said what you have for a driver. How can we answer this?

 

[jrizo1]

would normally use a fast blow fuse on parallel strings but since you are running one string per driver theres nothing much to do.

jrizo1; You never said what you have for a driver. How can we answer this?

I am sorry i have the mean well ELN60-48 D Controlled by apex
thanks

 

[jrizo1]

I just finish my LEDs fixture i did 14 cree xp LEDs in series per driver what should I use to protect it from burning
Fuse or Resistor? and what size?
thanks

o forgot to tell you i am using. tne mean well ELN60-48d controlled by apex

 

[brassmonkyballs]

o forgot to tell you i am using. tne mean well ELN60-48d controlled by apex

I guess I had already jumped to that conclusion somehow.....

 

[kcress]

It was the conclusion I'd have jumped to too brass, but that often comes back to bite us on the butt.

Then no jrizo1, you don't need to use fuses. The ELN does its best to protect its small LED chicks.

The resistor is optional. I would always add one though, as it's just to good a way to monitor the current thru the strings.

 

[jrizo1]

It was the conclusion I'd have jumped to too brass, but that often comes back to bite us on the butt.

Then no jrizo1, you don't need to use fuses. The ELN does its best to protect its small LED chicks.

The resistor is optional. I would always add one though, as it's just to good a way to monitor the current thru the strings.

thanks.
what size resistor?

 

[TheFishMan65]

3-5 watt 1 ohm is the easiest. The voltage drop is the same as the current going through it.

 

[kcress]

Fish has it.

 

[jrizo1]

Thank you

 

[sammy113]

I was testing my new lamp for temp hoping I can use it without fans (just for a cleaner exposed heatsink look) and I used a piece of electrical tape next to the LED's and the IR thermometer is reading ~125F how does that sound? the fins are about ~100F

Any suggestion?

 

[S2minute]

LEDs

LEDs

That`s a pretty cool setup Sammy What are those? 2 RBs and a White?
Placing them in a trio like that to make like a super LED. Pretty cool. Bet you can do the same with one 3up. Though i doubt you would be able to mix the colors like you did.

 

[sammy113]

That`s a pretty cool setup Sammy What are those? 2 RBs and a White?
Placing them in a trio like that to make like a super LED. Pretty cool. Bet you can do the same with one 3up. Though i doubt you would be able to mix the colors like you did.

yeah that's one neutral white and two Royal blues. Two of the clusters have 1 NW, 1 RB and 1 Cool Blue

I could have gone with 3up but I would have ETG to make them for me cause I haven't seen it easily available online in that configuration. Actually they told me they can do a 3up with two RB's wired in series and the white separately but the optic options were limited. That's why I decided to go this route. Also I wasn't sure if going this way with three LED clusters or the conventional way.

 

[TheFishMan65]

Sammy the temp is probably fine, but if you can lower it easily I would. And did you test in the orientation they will be running?

 

[CJO]

yeah that's one neutral white and two Royal blues. Two of the clusters have 1 NW, 1 RB and 1 Cool Blue

I could have gone with 3up but I would have ETG to make them for me cause I haven't seen it easily available online in that configuration. Actually they told me they can do a 3up with two RB's wired in series and the white separately but the optic options were limited. That's why I decided to go this route. Also I wasn't sure if going this way with three LED clusters or the conventional way.

I modified mine last weekend to group them in threes also. It seems to give a bit more shimmer.

CJ

 

[aquaenthusiast]

Question for the pros out there. Is there anything wrong with putting just the led emitter directly on an aluminum heatsink with some thermal paste? Do the aluminum stars just make it easier to work with the leds?

 

[TheFishMan65]

The LEDs are surface mount devices - they must be mounted to a circuit board. The start make it easier than designing your own.

 

[sammy113]

Sammy the temp is probably fine, but if you can lower it easily I would. And did you test in the orientation they will be running?

Thanks! That temp was taken at 100% power and I'm pretty sure it won't run that high. That may drop to 100F or so. Just test that spot. Will do more readings in more places to make sure.

 

[jpccusa]

Like FishMan said, once you put the array in the correct orientation (fins facing up), your temperature will greatly reduce due to heat convection.

 

[sammy113]

Like FishMan said, once you put the array in the correct orientation (fins facing up), your temperature will greatly reduce due to heat convection.

ooooh that's what fishman said... :spin2: i knew. Makes sense! haha gonna test that one

 

[patmack]

I know there has been some conversation on the Meanwell HLG series drivers. Was the bigger "replacement" for the eln 48 d the HLG-240 b? I am working on a 144 led project and would like the ability to use Cree XM series LEDs driven at 1.5 amps.